Press together and bolt together cranks can easily become out of balance and out of true. This will cause excessive vibrations or shaking, loss of power, and poor main bearing life. Loud noises from the crank case can be caused by a scissoring condition (when flywheel halves are no longer aligned) which is very common among used engines. Excessive play in connecting rods due to rod bearings being worn out can also cause the conditions listed above. A trued, welded and balanced crank will run more efficient, create more power, run smoother, and stay trued longer; which will prolong surrounding component life expectancy better than an equivalent crank that has not been trued to less than .0015" of run out with a welded pin in place.

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Harley Davidson